參數(shù)資料
型號(hào)： TPS2206DAP
廠商： Texas Instruments, Inc.
英文描述： DUAL-SLOT PC CARD POWER-INTERFACE SWITCH WITH RESET FOR SERIAL PCMCIA CONTROLLER
中文描述： 雙插槽PC卡電源，串行接口，PCMCIA控制器復(fù)位開(kāi)關(guān)
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 458K
代理商： TPS2206DAP
TPS2206
DUAL-SLOT PC CARD POWER-INTERFACE SWITCH
WITH RESET FOR SERIAL PCMCIA CONTROLLER
SLVS138B – MAY 1996 – REVISED JUNE 1998
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
overcurrent and over-temperature protection
PC Cards are inherently subject to damage that can result from mishandling. Host systems require protection
against short-circuited cards that could lead to power supply or PCB-trace damage. Even systems robust
enough to withstand a short circuit would still undergo rapid battery discharge into the damaged PC Card,
resulting in the rather sudden and unacceptable loss of system power. Most hosts include fuses for protection.
However, the reliability of fused systems is poor, as blown fuses require troubleshooting and repair, usually by
the manufacturer.
The TPS2206 takes a two-pronged approach to overcurrent protection. First, instead of fuses, sense FETs
monitor each of the power outputs. Excessive current generates an error signal that linearly limits the output
current, preventing host damage or failure. Sense FETs, unlike sense resistors or polyfuses, have an added
advantage in that they do not add to the series resistance of the switch and thus produce no additional voltage
losses. Second, when an overcurrent condition is detected, the TPS2206 asserts a signal at OC that can be
monitored by the microprocessor to initiate diagnostics and/or send the user a warning message. In the event
that an overcurrent condition persists, causing the IC to exceed its maximum junction temperature,
thermal-protection circuitry activates, shutting down all power outputs until the device cools to within a safe
operating region.
12-V supply not required
Most PC Card switches use the externally supplied 12-V V
pp
power for switch-gate drive and other chip functions,
which requires that power be present at all times. The TPS2206 offers considerable power savings by using
an internal charge pump to generate the required higher voltages from the 5-V or 3.3-V input; therefore, the
external 12-V supply can be disabled except when needed for flash-memory functions, thereby extending
battery lifetime. Do not ground the 12-V input if the 12-V input is not used. Additional power savings are realized
by the TPS2206 during a software shutdown in which quiescent current drops to a maximum of 1
μ
A.
backward compatibility and 3.3-V low-voltage mode
The TPS2206 is backward compatible with the TPS2202 AND TPS2202A products, with the following
considerations. Pin 25 (V
DD
on TPS2202/TPS2202A) is a no connect because bias current is derived from
either the 3.3-V input pin or the 5-V input pin. Also, the TPS2206 does not have the APWR_GOOD or
BPWR_GOOD VPP
reporting outputs. These are left as no connects.
The TPS2206 operates in 3.3-V low-voltage mode when 3.3 volts is the only available input voltage (V
I(5V)
=0).
This allows host and PC Cards to be operated in low-power 3.3-V-only modes such as sleep modes or pager
modes. Note that in this operation mode, the TPS2206 derives its bias current from the 3.3-V input pin and only
3.3 V can be delivered to the PC Card. The 3.3-V switch resistance increases, but the added switch resistance
should not be critical, because only a small amount of current is delivered in this mode. If 6% (198 mV) is allowed
for the 3.3-V switch voltage drop, a 500 m
switch could deliver over 350 mA to the PC Card.
voltage transitioning requirement
PC Cards, like portables, are migrating from 5 V to 3.3 V to minimize power consumption, optimize board space,
and increase logic speeds. The TPS2206 is designed to meet all combinations of power delivery as currently
defined in the PCMCIA standard. The latest protocol accommodates mixed 3.3-V/5-V systems by first powering
the card with 5 V, then polling it to determine its 3.3-V compatibility. The PCMCIA specification requires that the
capacitors on 3.3-V-compatible cards be discharged to below 0.8 V before applying 3.3-V power. This ensures
that sensitive 3.3-V circuitry is not subjected to any residual 5-V charge and functions as a power reset. The
TPS2206 offers a selectable V
CC
and V
pp
ground state, in accordance with PCMCIA 3.3-V/5-V switching
specifications, to fully discharge the card capacitors while switching between V
CC
voltages.
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參數(shù)描述
TPS2206IDAP 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2206IDAPG4 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Pwr Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2206IDAPR 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2206IDAPRG4 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2206IDB 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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